Stir together graham cracker crumbs, melted butter, and 1 tablespoon sugar. Press about 1 tablespoon of the mixture firmly into the bottom of each of 6 silicone muffin cups.
In a medium bowl, beat the cream cheese and 1/4 cup sugar with an electric mixer until smooth. Add the egg, vanilla extract, and sour cream and beat on low until just combined, being careful not to over-beat.
Divide the filling evenly among the muffin cups, pouring over the crust layer.
Preheat the air fryer to 310°F (155°C). Place the cups in the basket.
Air fry for 13 to 15 minutes until the edges are set but the centers still have a very slight jiggle.
Remove carefully and let cool to room temperature, then refrigerate for at least 2 hours until firm. Top with fresh strawberries before serving.